Method for Mapping Downlink Dedicated Pilots to Resource Elements in Extended Cyclic Prefix Frame Structure

1. A method for mapping downlink dedicated pilots to resource elements in an Extended Cyclic Prefix (Extended CP) frame, applied in a Long Term Evolution (LTE) system, comprising: mapping the first downlink dedicated pilot of a port to the 5 th orthogonal frequency division multiplexing symbol of a physical resource block in the time domain, and to the A th subcarrier in the frequency domain; wherein the physical resource block comprises 12 subcarriers in the frequency domain and 12 orthogonal frequency division multiplexing symbols in the time domain, and wherein A is 1 or 2 or 3; mapping the second downlink dedicated pilot to the 5 th orthogonal frequency division multiplexing symbol in the time domain, and to the (A+3) th subcarrier in the frequency domain; mapping the third downlink dedicated pilot to the 5 th orthogonal frequency division multiplexing symbol in the time domain, and to the (A+6) th subcarrier in the frequency domain; mapping the fourth downlink dedicated pilot to the 5 th orthogonal frequency division multiplexing symbol in the time domain, and to the (A+9) th subcarrier in the frequency domain; mapping the fifth downlink dedicated pilot to the 8 th orthogonal frequency division multiplexing symbol in the time domain, and to the B th subcarrier in the frequency domain; wherein, B is 1 or 2 or 3; mapping the sixth downlink dedicated pilot to the 8 th orthogonal frequency division multiplexing symbol in the time domain, and to the (B+3) th subcarrier in the frequency domain; mapping the seventh downlink dedicated pilot to the 8 th orthogonal frequency division multiplexing symbol in the time domain, and to the (B+6) th subcarrier in the frequency domain; mapping the eighth downlink dedicated pilot to the 8 th orthogonal frequency division multiplexing symbol in the time domain, and to the (B+9) th subcarrier in the frequency domain; mapping the ninth downlink dedicated pilot to the 12 th orthogonal frequency division multiplexing symbol in the time domain, and to the C th subcarrier in the frequency domain; wherein, C is 1 or 2 or 3; mapping the tenth downlink dedicated pilot to the 12 th orthogonal frequency division multiplexing symbol in the time domain, and to the (C+3) th subcarrier in the frequency domain; mapping the eleventh downlink dedicated pilot to the 12 th orthogonal frequency division multiplexing symbol in the time domain, and to the (C+6) th subcarrier in the frequency domain; mapping the twelfth downlink dedicated pilot to the 12 th orthogonal frequency division multiplexing symbol in the time domain, and to the (C+9) th subcarrier in the frequency domain; and transmitting the Extended CP frame with the downlink dedicated pilots to a user equipment; wherein, only one port of downlink dedicated pilots is transmitted in the physical resource block.

2. A method for mapping downlink dedicated pilots to resource elements in an Extended Cyclic Prefix (Extended CP) frame, applied in a Long Term Evolution (LTE) system, comprising: dividing a port of twelve downlink dedicated pilots into three groups, each group comprising four downlink dedicated pilots that are located at a same orthogonal frequency division multiplexing symbol of a physical resource block; wherein the physical resource block comprises 12 subcarriers in the frequency domain and 12 orthogonal frequency division multiplexing symbols in the time domain; in the time domain, mapping the first group of downlink dedicated pilots to the 5 th orthogonal frequency division multiplexing symbol in the time domain; mapping the second group of downlink dedicated pilots to the 8 th orthogonal frequency division multiplexing symbol in the time domain; and mapping the third group of downlink dedicated pilots to the 11 th or 12 th orthogonal frequency division multiplexing symbol in the time domain; in the frequency domain, mapping the 1 st one of 4 downlink dedicated pilots in each group to the 1 st or 2 nd or 3 rd subcarrier in the frequency domain, and mapping the 2 nd to 4 th downlink dedicated pilots to subcarriers that are two subcarriers apart from each other in order in the frequency domain; and transmitting the Extended CP frame with the downlink dedicated pilots to a user equipment; wherein, only one port of downlink dedicated pilots is transmitted in the physical resource block.

3. A method for mapping downlink dedicated pilots to resource elements in an Extended Cyclic Prefix (Extended CP) frame, applied in a Long Term Evolution (LTE) system, comprising: dividing a port of twelve downlink dedicated pilots into three groups, each group comprising four downlink dedicated pilots that are located at the same orthogonal frequency division multiplexing symbol of a physical resource block; wherein the physical resource block comprises 12 subcarriers in the frequency domain and 12 orthogonal frequency division multiplexing symbols in the time domain; in the time domain, mapping the first group of downlink dedicated pilots to the 5 th orthogonal frequency division multiplexing symbol in the time domain; mapping the second group of downlink dedicated pilots to the 9 th orthogonal frequency division multiplexing symbol in the time domain; and mapping the third group of downlink dedicated pilots to the 12 th orthogonal frequency division multiplexing symbol in the time domain; in the frequency domain, mapping the 1 st one of four downlink dedicated pilots in each group to the 1 st , 2 nd or 3 rd subcarrier in the frequency domain, and mapping the 2 nd to 4 th downlink dedicated pilots to subcarriers that are two subcarriers apart from each other in order in the frequency domain; and transmitting the Extended CP frame with the downlink dedicated pilots to a user equipment; wherein, only one port of downlink dedicated pilots is transmitted in the physical resource block.

4. The mapping method according to claim 2 , wherein: the 1 st , 2 nd , 3 rd , 4 th downlink dedicated pilots are all mapped to the 5 th OFDM symbol in the time domain, and to the 1 st , 4 th , 7 th , 10 th subcarriers sequentially in the frequency domain; the 5 th , 6 th , 7 th , 8 th downlink dedicated pilots are all mapped to the 8 th OFDM symbol in the time domain, and to the 1 st , 4 th , 7 th , 10 th subcarriers sequentially in the frequency domain, or to the 3 rd , 6 th , 9 th , 12 th subcarriers sequentially in the frequency domain; the 9 th , 10 th , 11 th , 12 th downlink dedicated pilots are all mapped to the 11 th or 12 th OFDM symbol in the time domain, and to the 1 st , 4 th , 7 th , 10 th subcarriers sequentially in the frequency domain.

5. The mapping method according to claim 2 , wherein: the 1 st , 2 nd , 3 rd , 4 th dedicated pilots are all mapped to the 5 th OFDM symbol in the time domain, and to the 1 st , 4 th , 7 th , 10 th subcarriers sequentially in the frequency domain; the 5 th , 6 th , 7 th , 8 th downlink dedicated pilots are all mapped to the 8 th OFDM symbol in the time domain, and to the 2 nd , 5 th , 8 th , 11 th subcarriers sequentially in the frequency domain; the 9 th , 10 th , 11 th , 12 th downlink dedicated pilots are all mapped to the 11 th or 12 th OFDM symbol in the time domain, and to the 3 rd , 6 th , 9 th , 12 th subcarriers sequentially in the frequency domain.

6. The mapping method according to claim 3 , wherein: the 1 st , 2 nd , 3 rd , 4 th downlink dedicated pilots are all mapped to the 5 th OFDM symbol in the time domain, and to the 1 st , 4 th , 7 th , 10 th subcarriers sequentially in the frequency domain; the 5 th , 6 th , 7 th , 8 th downlink dedicated pilots are all mapped to the 9 th OFDM symbol in the time domain, and to the 3 rd , 6 th , 9 th , 12 th subcarriers sequentially in the frequency domain; the 9 th , 10 th , 11 th , 12 th downlink dedicated pilots are all mapped to the 12 th OFDM symbol in the time domain, and to the 1 st , 4 th , 7 th , 10 th subcarriers sequentially in the frequency domain.